Electric range



July 22, 1941. E. CHALLET ELECTRIC RANGE Filed Jan. 3, 1939 2Sheets-Sheet 1 1941- E. CHALLET ELECTRIC RANGE Filed Jan. 3, 1939 July22 2 Sheets-Sheet 2 Patented July 22, 1941 ELECTRIC RANGE EtienneChallet, Paris, France, assignor of one- !ourth to EntreprisesElectriques Fribourgeoises,

Frlbourg, France Application January 3, 1939, Serial No. 249,132 InFrance November 24, 1938 4 Claims.

It is known to use plates made of a plurality of parts which are adaptedto be depressed more or less when a receptacle having a more or lessdeformed bottom is placed on them. Plates of this type are described inSwiss Patent No. 193,- 023 and Swiss patent of addition No. 199,640.

The present invention has for its object a device which permits of thesimple arrangement of the spring system that serves for retracting themovable plate element or elements of this kind, for the purpose ofshielding said spring system from the action of the heat evolved by theplate and consequently of enabling it to retain its resilientproperties, while ensuring a perfoot operation.

The device according to the invention is characterized by the fact thatthe spring system is lodged below the plate proper and in the spacenormally reserved for an earthenware part or parts from which theconnecting prongs emerge.

According to the type of plate used, one or a plurality of springs maybe employed, and at the same time connecting rods, equalizing bars,bearing members are provided for the various movable elements, so as toconnect same to the spring which constantly tends to bring said elementsback to their upper position.

By way of example, variousembodiments of plates equipped with springsaccording to the invention have been shown in the accompanying drawings.

In said drawings:

Fig. 1 shows a section of a plate, the central part or head of which ismovable, with a fixed annular part and a single central spring insidethe insulating parts of the plugs.

V Fig. 2 shows a partial plan view of the detail a of an arm of theshell.

Fig. 3 is a section along III-III of Fig. 1.

Fig. 4 shows the section of a similar plate to that of Fig. 1, but witha spring of larger diameter located outside the insulating parts of theplugs.

Fig. 5 is a section of a plate having a movable central head, a movableintermediate annular tops of which will advantageously be shaped likeSaid annular shell is closed at the bottom by a disc 8 which is fixed at9 under the three arms, one of which is shown at I, and at H),against'the" shell.

Under the lower part of the disc 8 is fixed a squirrel cage, the holesof which are visible at l2 in Fig. 13 and which is closed by acontinuous.

bottom l3. On the bottom of said squirrel cage is fixed the earth plug.Theconnecting plugs such as l5 are arranged in separate insulating partsl6 which are held between the bottom 8 i and the plate l3 of thesquirrel cage.

The spring I1 is located at the centre of the space betweenthe'insulating parts IE: it is surmounted by a cap i8 having a hollowl9, so as to receive a push rod 20, the other end of which bears at 2|under the head-2r It will be understood that when a receptacle filledwith liquid or other substance is placed on the head, the same tends tobe depressed and compresses the spring I! through the intermediary'ofthe rod 20. The lower part 22 of the head 2 limits the downward travelof said head, since it abuts against the flange 6. On the contrary, whenthe head moves upwards again, the travel of same is limited by means oftongues such as 23 which are bent and abut under the flange 6 of theshell.

The shell 5 is provided with a hole 24- Fig. 2)

in order to enable a tube 25, which supports the ring, to be fixedtherein.

In Fig. 4 there is the same device. formed by the outer ring I and themovable head 2; all the other parts are identical, including thesquirrel cage II, but the spring 26- is outside the insulating parts It.It is therefore of larger diameter and is better ventilated. A pluralityof push rods, preferably three, are interposed between the spring andthe head. One of said rods is shown at 21.

Both in Fig. 1 and in Fig. 4 it will therefore be seen that the springsare open to the atmosphere and are as remote as possible from theheating parts. Owing to the holes II 01' the squirrel cage, they candisperse the small amount of heat they may still collect.

Fig. 5 shows a plate comprising a movable head 28, a movableintermediate ring 20, and a fixed outer ring 30. Abutment tongues 33have also been provided.

The arms such as 34 are in this case provided with two holes 35 and 30;the hole 3! receives a fixed tube 31 which supports the outer ring 84,the hole 36 receives a sheath 3 in which is adapted to slide a piston 39which is fixed under the movable ring 29. An equalizer bar 40 is pivotedat one of its ends, on the lower part of the piston 39, and bears at itsother end under the head 2! through the intermediary of a push rod 42which is held in recesses 4| and 43. There are preferably threeequalizer equipments at 120 to each other, controlled by the same pushrod 42.

Each equalizer rests on a rod 44 which is opposite the convolutions oi.the spring, which it receives /;;,oi the thrust; the lever arms of anequalizer are calculated according to the respective weights of the head28 and of the movable ring 28. Advantageously also the head and theannular elements are provided with annular crests, as shown in dottedlines.

Fig. '7 is similar to Fig. 5, but the central head is replaced by aheating torus 4B, the movable annular element is replaced by the movabletorus 41, the fixed outer element is replaced by the torus 48; there areagain the same equalizer systems 40 with a rod 55 passing through asheath 49, each equalizer supporting at the other end a rod 50 whichabuts at the upper part in the hollow of a plate 52 having an edge 53,so as to support the torus 48.

Tongues 54 serve as abutments, for the upward travel, against the flange52, whereas in the downward movement, the travel of the torus 4B islimited by the edge 53 under the flange 32. The arrangement of thespring 45 in the squirrel cage i I is also seen, as it is moreover inFig. 5.

The cross-section of the toms is not necessarily round, it may beflattened at the top, be of elliptical shape or bean-shaped, etc.;instead of one torus, there may be two or three toruses which more orless touch each other, as indicated in the aforesaid Swiss patent andpatent of addition.

The spring mounting device for an electric heating plate having at leastone movable element can be adapted to any other kind of electric heatingplates which are not shown in the drawings which have only been given byway of example, and in particular to plates in which all the elementsare movable.

Said device can also be advantageously adapted to plates havingconnecting plugs or pins arranged elsewhere than at the centre andunderneath; in this case said device remains located in the central partand underneath.

I claim:

1. In an electric range, a hot plate comprising a central movablemushroom-shaped heating element, a movable intermediate heating ring, afixed outer heating ring, a central push rod bearing at one end againstsaid central heating element in order to support the same, push rodslocated below said movable ring for supporting the same, diametricallyopposed equalizer bars cooperating with said central push rod and saidpush rods cooperating with said movable ring, a spring located belowsaid hot plate and push rods reacting with said equalizers and saidspring so as to support said central heating element and said movablering.

2. In an electric range, a hot plate comprising a central movablemushroom-shaped heating element, a movable intermediate heating ring anda fixed outer heating ring, a central push rod located below saidcentral heating element for supporting said element at its center, threepush rods cooperating with said movable ring and spaced from oneanother, equalizer bars cooperating with said central push rod and saidthree push rods, a spring located below said hot plate, connecting rodscooperating with the upper convolution of said spring and saidequalizers so as to support said central heating element and saidintermediate movable ring.

3. In an electric range, a hot plate comprising a central movablemushroom-shaped heating element, a movable intermediate heating ring anda fixed outer heating ring, a central push rod located below saidcentral heating element to support the same, a plurality oi push rodscooperating with said intermediate heating ring, a plurality ofequalizers extending between said central push rod and said plurality ofpush rods cooperating with said intermediate heating ring, a helicalspring located below said hot plate and a connecting rod for eachequalizer cooperating with the upper convolution of said spring and saidequalizers so as to support said central heating element and saidintermediate heating ring.

4. In an electric range, a hot plate comprising a central movableheating toms, a movable medial torus and a fixed outer heating torus, a

central plate supporting said central torus, a: push rod cooperatingwith said central plate,'a

push rod cooperating with said medial torus, an equalizer cooperatingwith said central push rod and said push rod cooperating with saidmedial torus, a spring located below said hot plate and a connecting rodcooperating with said spring and said equalizer.

ETIENNE CHALLET.

